MongoDB

 MongoDB is an open source, document-based database management system that does not require a table schema description. MongoDB - classified as NoSQL and uses JSON-like documents and a database schema. If all four previous DBMSs are well known to most IT professionals, then few have heard of MongoDB. But she confidently takes the 5th line in almost all ratings. And as a result, in our ranking, she also occupies the 5th position.

symmetrical triangle- Симметричный треугольник

 A symmetrical triangle reflects a situation in which price tops are lower and price bottoms are higher. Both sides of the triangle have the same angle of inclination. With this pattern, it is extremely difficult to determine the price movement. A breakout can trigger a price move equal to the size of the pattern.